Quote from @Michael Overall: Good day, If an investor has 10 rentals and wanted to over time sell them and put the money tax free from a 1031 toward a large purchase is there a process to do that? 

I can help with the refinance to pull equity out, but no the purchase, as 99% of the industry won't finance mobile homes. 

I don't know if this is for you, but my husband and I have mentored quite a few investors in Canada and helped them purchase their own multifamily. 

How to track potential growth in an area to see if a lot is viable for purchase and building spec homes on etc. 

It's calculated as the ratio of your total loan amount (loan amount for purchase + loan amount for your rehab) to your total costs (purchase price + rehab budget). 95% is a good target.Avoid application and other upfront/junk fees. 

Purchase price will be around $400-450K. 

(You said you could purchase them $20-$15,000 below market value. 

Deal 2: Duplex (older home that needs TLC in good location)Purchase price: 120k, Rehab 40k, Total all in: 180kExpected Rent: $2,400/month to $2,700/monthDeal 3: 5 Plex (is that even a word?

As long as you purchase at least as much as your net sale. 

I have a followup question - I will realize a lot of capital gain from this home in Idaho, so I think unless I purchase a new primary residence I will have to pay that capital gains tax.